The B.D. and T.D. on a certain sum is Rs. 200 and Rs. 100 respectively. Find out the sum.

A. Rs. 400

B. Rs. 300

C. Rs. 100

D. Rs. 200

Answer: Option D

Solution(By Examveda Team)

$$\eqalign{ & F = \frac{{BD \times TD}}{{BD - TD}} \cr & \,\,\,\,\,\,\,\, = \frac{{200 \times 100}}{{200 - 100}} \cr & \,\,\,\,\,\,\,\, = \frac{{200 \times 100}}{{100}} \cr & \,\,\,\,\,\,\,\, = {\text{Rs}}{\text{.}}\,200 \cr} $$